/*! ===========================================================================
 *  Alpéia — components
 *  Buttons, links, forms, cards, table, badges, alerts, header, footer.
 *  Consumes tokens only (tokens.css). Charter rules applied here:
 *    §7.3  radii <= 8 px, pill for badges only; a card carries a border OR a
 *          shadow, never both
 *    §8.1  buttons 2 px radius, >= 44 px high, nav without emoji
 *    §9    focus always visible, 44 px targets, never colour alone
 * =========================================================================== */

/* --- Buttons ------------------------------------------------------------ */
.alpeia-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-height);
  padding: var(--space-2) var(--space-6);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-accent);
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard);
}

.alpeia-btn--primary {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: var(--color-on-brand);
}

.alpeia-btn--primary:hover {
  background: var(--color-brand-hover);
  border-color: var(--color-brand-hover);
}

.alpeia-btn--primary:active {
  background: var(--color-brand-active);
  border-color: var(--color-brand-active);
}

.alpeia-btn--secondary {
  background: transparent;
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.alpeia-btn--secondary:hover {
  background: var(--color-surface-alt);
}

.alpeia-btn--secondary:active {
  background: var(--color-surface-alt);
  border-color: var(--color-brand-active);
}

.alpeia-btn--tertiary {
  background: transparent;
  border-color: transparent;
  color: var(--color-link);
  padding-inline: var(--space-3);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.alpeia-btn--tertiary:hover {
  color: var(--color-brand);
  text-decoration-thickness: 2px;
}

.alpeia-btn--ghost {
  background: transparent;
  border-color: var(--color-border-control);
  color: var(--color-text);
}

.alpeia-btn--ghost:hover {
  background: var(--color-surface-alt);
}

/* Disabled (charter §3.4: granit-300 border, muted label). */
.alpeia-btn:disabled,
.alpeia-btn[aria-disabled="true"] {
  background: var(--color-surface-alt);
  border-color: var(--color-border-disabled);
  color: var(--color-text-muted);
  cursor: not-allowed;
  text-decoration: none;
}

/* Busy: the application replaces the label; CSS only blocks re-entry. */
.alpeia-btn[aria-busy="true"] {
  cursor: progress;
  pointer-events: none;
}

/* --- Links -------------------------------------------------------------- */
.alpeia-link {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--duration-fast) var(--ease-standard);
}

.alpeia-link:hover {
  color: var(--color-brand);
  text-decoration-thickness: 2px;
}

/* A link that is also a heading: same colour as the heading, still
   underlined so the affordance never rests on colour alone (R-A7). */
.alpeia-link--heading {
  color: inherit;
  text-decoration-color: var(--color-link);
}

/* --- Header and navigation --------------------------------------------- */
.alpeia-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.alpeia-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-6);
  min-height: var(--header-height);
}

@media (min-width: 900px) {
  .alpeia-header__inner {
    min-height: var(--header-height-desktop);
  }
}

/* Below 900 px the header stacks on two rows: logotype and theme switch on
   the first, the navigation underneath (charter §8.1, 64 px on mobile). */
@media (max-width: 899px) {
  .alpeia-nav {
    order: 2;
    flex-basis: 100%;
    margin-inline-start: var(--space-0);
  }
  .alpeia-theme-toggle {
    order: 1;
    margin-inline-start: auto;
  }
}

.alpeia-logo {
  width: var(--logo-width);
  height: auto;
  display: block;
}

/* Two logo files: the dark-ink version on light surfaces, the pale version
   on dark ones (charter §5.2 — never recolour the artwork in code). */
.alpeia-logo--on-dark {
  display: none;
}

[data-theme="dark"] .alpeia-logo--on-light {
  display: none;
}

[data-theme="dark"] .alpeia-logo--on-dark {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .alpeia-logo--on-light {
    display: none;
  }

  :root:not([data-theme="light"]) .alpeia-logo--on-dark {
    display: block;
  }
}

.alpeia-nav {
  margin-inline-start: auto;
}

.alpeia-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: var(--space-0);
  padding: var(--space-0);
}

/* 1 px separators between items (charter §8.1). */
.alpeia-nav__list > li + li {
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
}

.alpeia-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-height);
  color: var(--color-text);
  font-weight: var(--weight-accent);
  /* Normal case, no emoji: charter §8.1. */
  text-decoration: none;
  text-transform: none;
  border-bottom: 2px solid transparent;
  transition: color var(--duration-fast) var(--ease-standard);
}

.alpeia-nav__link:hover {
  color: var(--color-link);
}

/* Current page: 2 px brand underline (charter §8.1). The aria-current
   attribute drives it, so the state cannot drift from the markup. */
.alpeia-nav__link[aria-current] {
  color: var(--color-brand);
  border-bottom-color: var(--color-brand);
}

/* --- Cards -------------------------------------------------------------- */
.alpeia-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

/* Raised variant: shadow instead of border, never both (charter R-M2). */
.alpeia-card--raised {
  border: 0;
  box-shadow: var(--shadow-sm);
}

.alpeia-card > :first-child {
  margin-top: 0;
}

.alpeia-card__eyebrow {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

/* One accent per page, at most (charter §3.7 and §8.3). */
.alpeia-card__eyebrow--accent {
  color: var(--color-accent);
}

.alpeia-card__foot {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* Key figure (charter §4.2, display size). */
.alpeia-stat {
  display: block;
}

.alpeia-stat__value {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-display);
  color: var(--color-brand);
  font-variant-numeric: tabular-nums;
}

.alpeia-stat__label {
  display: block;
  margin-top: var(--space-2);
  color: var(--color-text-muted);
}

/* --- Table ------------------------------------------------------------- */
.alpeia-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
}

.alpeia-table {
  width: 100%;
  min-width: var(--table-min-width);   /* legible columns; scrolls in its wrapper */
  border-collapse: collapse;
  border-radius: var(--radius-none);   /* charter §7.3: no radius on tables */
  background: var(--color-surface);
  font-size: var(--text-base);
}

.alpeia-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.alpeia-table th,
.alpeia-table td {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  vertical-align: top;
}

.alpeia-table thead th {
  background: var(--color-surface-alt);
  color: var(--color-brand);
  font-family: var(--font-body);
  font-weight: var(--weight-heading);
}

.alpeia-table tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}

/* Tabular figures, right aligned: amounts must be comparable (charter §8.1). */
.alpeia-table .alpeia-num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;   /* never break an amount across two lines */
}

/* Table foot: the "Total" line of a quote or invoice (charter §8.3 —
   brand aplat, pale ink; the brand flips in the dark theme). */
.alpeia-table tfoot th,
.alpeia-table tfoot td {
  background: var(--color-brand);
  color: var(--color-on-brand);
  font-weight: var(--weight-heading);
  border-bottom: 0;
  border-top: 2px solid var(--color-bg);   /* page-coloured gap instead of a rule */
}

/* --- Badges ------------------------------------------------------------ */
.alpeia-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-accent);
  line-height: 1.4;
  white-space: nowrap;
}

.alpeia-badge--success {
  background: var(--color-success-surface);
  color: var(--color-brand-alt);
}

.alpeia-badge--warning {
  background: var(--color-warning-surface);
  color: var(--color-warning);
}

.alpeia-badge--danger {
  background: var(--color-danger-surface);
  color: var(--color-danger);
}

.alpeia-badge--info {
  background: var(--color-info-surface);
  color: var(--color-info);
}

/* --- Alerts ------------------------------------------------------------
   Four states, each with its own surface, filet and *word*: the state is
   never carried by colour alone (charter R-A7). */
.alpeia-alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-left: 3px solid var(--color-border-control);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.alpeia-alert__icon {
  flex: 0 0 auto;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.15rem;
}

.alpeia-alert__title {
  display: block;
  font-weight: var(--weight-heading);
  margin-bottom: var(--space-1);
}

.alpeia-alert__body :last-child {
  margin-bottom: 0;
}

.alpeia-alert--info {
  background: var(--color-info-surface);
  border-left-color: var(--color-info);
}

.alpeia-alert--info .alpeia-alert__title,
.alpeia-alert--info .alpeia-alert__icon {
  color: var(--color-info);
}

.alpeia-alert--success {
  background: var(--color-success-surface);
  border-left-color: var(--color-success);
}

.alpeia-alert--success .alpeia-alert__title,
.alpeia-alert--success .alpeia-alert__icon {
  color: var(--color-success);
}

.alpeia-alert--warning {
  background: var(--color-warning-surface);
  border-left-color: var(--color-warning);
}

.alpeia-alert--warning .alpeia-alert__title,
.alpeia-alert--warning .alpeia-alert__icon {
  color: var(--color-warning);
}

.alpeia-alert--danger {
  background: var(--color-danger-surface);
  border-left-color: var(--color-danger);
}

.alpeia-alert--danger .alpeia-alert__title,
.alpeia-alert--danger .alpeia-alert__icon {
  color: var(--color-danger);
}

/* --- Forms ------------------------------------------------------------- */
.alpeia-form {
  max-width: 44rem;
}

.alpeia-field {
  display: block;
  margin-bottom: var(--space-6);
}

.alpeia-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--weight-accent);
  color: var(--color-text);
}

.alpeia-label__optional {
  color: var(--color-text-muted);
  font-weight: var(--weight-body);
}

.alpeia-input,
.alpeia-select,
.alpeia-textarea {
  display: block;
  width: 100%;
  min-height: var(--control-height);
  padding: var(--space-2) var(--space-3);
  background: var(--color-field-bg);   /* 3:1 control border in both themes */
  color: var(--color-text);
  border: 1px solid var(--color-border-control);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.4;
}

.alpeia-textarea {
  min-height: calc(var(--control-height) * 2);
  resize: vertical;
}

.alpeia-input::placeholder,
.alpeia-textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 1;
}

.alpeia-input:disabled,
.alpeia-select:disabled,
.alpeia-textarea:disabled {
  background: var(--color-surface-alt);
  border-color: var(--color-border-disabled);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.alpeia-help {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.alpeia-error {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-top: var(--space-1);
  color: var(--color-danger);
  font-size: var(--text-sm);
}

.alpeia-error__icon {
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
  margin-top: 0.1rem;
}

/* Invalid state: red control border, red label, icon + text message.
   aria-invalid drives it, so the visual state matches the semantics. */
.alpeia-input[aria-invalid="true"],
.alpeia-select[aria-invalid="true"],
.alpeia-textarea[aria-invalid="true"] {
  border-color: var(--color-danger);
  border-width: 2px;
}

.alpeia-field:has([aria-invalid="true"]) .alpeia-label {
  color: var(--color-danger);
}

/* Choice rows: the whole row is the target, so it clears 44 px (R-A5). */
.alpeia-choice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  min-height: var(--control-height);
  padding-block: var(--space-2);
  cursor: pointer;
}

.alpeia-choice input {
  flex: 0 0 auto;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.2rem;
  accent-color: var(--color-brand);
}

.alpeia-choice__label {
  display: block;
  font-weight: var(--weight-accent);
}

.alpeia-choice__help {
  display: block;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
}

.alpeia-fieldset {
  border: 0;
  padding: 0;
  margin: 0 0 var(--space-6);
}

.alpeia-fieldset legend {
  padding: 0;
  margin-bottom: var(--space-2);
  font-weight: var(--weight-accent);
}

.alpeia-form__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

/* --- Footer ------------------------------------------------------------ */
.alpeia-footer {
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-12);
  color: var(--color-text-muted);
}

.alpeia-footer a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.alpeia-footer .alpeia-caps {
  margin: 0;
}

.alpeia-footer__grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 640px) {
  .alpeia-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .alpeia-footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.alpeia-footer__list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
}

.alpeia-footer__list li + li {
  margin-top: var(--space-2);
}

/* Legal note: the only place the charter allows the 12 px size (§4.2). */
.alpeia-footer__legal {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  line-height: 1.5;
}

.alpeia-footer__mark {
  width: 2rem;
  height: auto;
}

/* --- Theme switch ------------------------------------------------------- */
.alpeia-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-height);
  min-width: var(--control-height);
  padding-inline: var(--space-3);
  background: transparent;
  border: 1px solid var(--color-brand);   /* brand-ink border: the charter's
                                             dark control border only meets
                                             3:1 on the page, not on the
                                             header surface */
  border-radius: var(--radius-sm);
  color: var(--color-brand);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-accent);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.alpeia-theme-toggle:hover {
  background: var(--color-surface-alt);
}